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A tank is filled with two inlet pipes A ...

A tank is filled with two inlet pipes A & B Both the pipes are kept for 10 minutes so that the tank is two - third full and then pipe A is closed. How much time will B take to fill remaining part of the tank ?
(i) Pipie A is thrice as fast as pipe B.
(ii) Pipe B alone can fill the tank in 60 minutes

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